*********** Account Department and Client Services

I recently signed up with Cartrack (December), I used to have a cartrack aa feature for my dad over 5 years ago, so Cartrack had my old details. While signing up, I gave the agent my new banking details and all other new personal info only to have my installment deducted on an account I don't use anymore. I've called so many times (more than 10 times!!!) to update my banking details and my details are not only not updated, I have an incorrect amount outstanding that's apparently due. How do I owe over 5 months in installments when I've only had cartrack for 3 months??? Make it make sense!!!!!